package com.nowcoder.community.service;/**
 * @description:
 * @Author HP
 * @create 2021/12/18 14:51
 */

import com.nowcoder.community.dao.CommentMapper;
import com.nowcoder.community.entity.Comment;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.SensityFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.util.HtmlUtils;

import java.util.List;

/**
 * @author HP
 * @create 2021-12-18 14:51
 * @desc 评论的服务层
 **/
@Service
public class CommentService implements CommunityConstant {

    @Autowired
    private CommentMapper commentMapper;

    @Autowired
    private SensityFilter sensityFilter;

    @Autowired
    private DiscussPostService discussPostService;

    public List<Comment> findCommentsByEntityId(int entityType,int entityId,int offset,int limit){
        return commentMapper.selectCommentsByEntityId(entityType,entityId,offset,limit);
    }

    public int findCommentCount(int entityType,int entityId){
        return commentMapper.selectCountByEntity(entityType,entityId);
    }

    @Transactional(isolation = Isolation.READ_COMMITTED,propagation = Propagation.REQUIRED)
    public int addComment(Comment comment){
        if (comment==null){
            throw new IllegalArgumentException("参数不能为空");
        }
        //添加评论
        comment.setContent(HtmlUtils.htmlEscape(comment.getContent()));
        comment.setContent(sensityFilter.filter(comment.getContent()));
        int rows=commentMapper.insertComment(comment);

        //更新帖子评论数量
        if (comment.getEntityType()==ENTITY_TYPE_POST){
            int count=commentMapper.selectCountByEntity(comment.getEntityType(),comment.getEntityId());
            discussPostService.updateCommentCount(comment.getEntityId(),count);
        }
        return rows;
    }

    public Comment findCommentById(int id){
        return commentMapper.selectCommentById(id);
    }

}
